Questions about my
JBL 4425 equipped with
> 2342 Bi-Radial Horn
> 2415H "salt shaker phase plug"
> Radian 1225/8 Aluminium
listening to this horn speaker sometimes causes 'slightly' peaking resonances in the 3.1kHz range. The 2342 horn seems to be a little "shouty" in midrange with some recordings, especially with femal voices hitting the 3kHz range. Also sampled "hand-claps" or other sounds in this 3.1K range causes this slightly fatigue sound. (this is not caused by my listening room !)
If i compare the 4425 to all my headphones (Audeze Lcd-2, AKG K701, Beyerdynamic T1,Sennheiser HD650) i can locate this 'hot' 3kHz area, but without the slightly nerving & peaking resonance.
My 4425 is stamped 1988 and original fitted with the 2415 Magnet. I do not have a 2416 with slit slot phase plug for comparsion.
The problem was also with the orig. Titamium diaphragm.
The freq. network and the pads are in perfect shape, no scratching noise from the mid/high pads.
So what cause this little frequency dip ? Is this a generally problem of this 2342 bi-radial design , or perhaps caused by the 'older' 2415 salt shaker phase plug ?
On different JBL 4425 freq./spec-sheets there is a very little dip in exactly that area.
Is there a side by side comparsion between the 2342/2344 with same drivers in it ?
...or do all horns generally suffer from this problems ?